1. Amazon
In 2015, Amazon surpassed Walmart as the most valuable retailer in the United States by market capitalization. Amazon is the fourth most valuable public company in the world, the largest Internet company by revenue in the world and the eighth largest employer in the United States. In 2017, Amazon announced their plans to acquire Whole Foods Market for $13.4 billion by the end of the year, which would vastly increase Amazon's presence as a physical retailer. The acquisition was interpreted by some as a direct attempt to challenge Walmart as a physical store.
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2. Aliexpress
Launched in 2010, AliExpress.com is an online retail service made up of small businesses in China and elsewhere offering products to international online buyers. It is owned by Alibaba. It is the most visited e-commerce website in Russia and was the 10th most popular website in Brazil. It facilitates small businesses to sell to customers all over the world, and, just like Amazon, one can find just almost anything for sale. It is more accurate to compare AliExpress to eBay, as sellers are independent, using Aliexpress as a host to sell to consumers and other businesses.
3. Ebay
eBay Inc. (/ˈiːˌbeɪ/ EE-bay, stylized as ebay) is a multinational e-commerce corporation, facilitating online consumer-to-consumer and business-to-consumer sales. It is headquartered in San Jose, California. eBay was founded by Pierre Omidyar in 1995, and became a notable success story of the dot-com bubble. Today it is a multibillion-dollar business with operations in about 30 countries.